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Transmitting and receiving apparatus having plural antenna in multi-user environments and method thereof

a multi-user environment and transmitting and receiving technology, applied in the field of radio transmitting and receiving apparatus, can solve the problems of difficult system application of limited research on almost all of the mimo technologies in the related art, and inability to achieve high-speed radio data rate, etc., to achieve the effect of reducing influence, increasing data rate of radio communication system, and effective use of limited radio resources

Active Publication Date: 2010-09-16
SEOUL NAT UNIV R&DB FOUND
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  • Abstract
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AI Technical Summary

Benefits of technology

[0020]According to the present invention, the following effects can be achieved.
[0021]First, a method is suggested, in which a transmitting terminal obtains interference channel information between receiving terminals of adjacent cells in a multi-user and multi-cell environment. Therefore, a transmission method can be implemented in consideration of an influence due to interference on the adjacent cells when a signal is transmitted.
[0022]Second, the present invention uses a transmission method that not only considers performance of a corresponding cell but also an influence due to interference on adjacent cells and an influence due to interference from the adjacent cells in a multi-user and multi-cell environment. As a result, it is possible to decrease an influence due to interference between cells that exists in a multi-cell environment. Therefore, limited radio resources can be effectively used and a data rate of a radio communication system can be increased.
[0023]Third, various transmission methods, such as a transmission beamforming method, a multi-stream transmission method, and a multi-user transmission method, are suggested. Therefore, the various transmission methods can be applied to various communication systems in a multi-cell environment, and performance of the communication systems can be improved.
[0024]Fourth, a method that determines a transmission beamforming vector and a user combination in consideration of performance of a corresponding cell and adjacent cells is suggested. If the number of transmitting antennas increases, excellent performance can be obtained, and performance and a data rate of the entire system can be increased.

Problems solved by technology

However, studies on almost all of the MIMO technologies in the related art have a limitation in that an influence due to interference between adjacent cells in a multi-cell environment as an actual radio communication environment is not considered, because only a single cell environment is considered.
In particular, since an influence due to interference between the cells increases while a frequency reutilization rate between cells increases, the interference is the main cause for obstruction such that a high-speed radio data rate cannot be achieved.
Therefore, it is difficult for this technology to be actually applied to the system.

Method used

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  • Transmitting and receiving apparatus having plural antenna in multi-user environments and method thereof
  • Transmitting and receiving apparatus having plural antenna in multi-user environments and method thereof
  • Transmitting and receiving apparatus having plural antenna in multi-user environments and method thereof

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fourth embodiment

Multi-Stream Transmission Method Based on Water-Filling Algorithm

[0090]When using the multi-stream transmission method based on the water-filling algorithm, a beamforming matrix that is used by the terminal of the m-th cell is assumed as Wm(2). At this time, Wm(2) is a matrix (Nt×Ns(2)) that is composed of Ns(2) column vectors. In this case, Ns(2) denotes the number of streams that are simultaneously transmitted. In the multi-stream transmission method based on the water-filling algorithm, the number of streams Ns(2) and the transmission beamforming matrix are determined on the basis of the water-filling algorithm. Referring to FIG. 5, the channel information estimating unit 110 estimates desired channel information and interference channel information (S10). If a transmission weighting value determination method in the transmission method implementing unit 120 is selected as a maximum SGINR transmission beamforming scheme (S15), the transmission beamforming matrix calculating unit ...

fifth embodiment

Transmission Method Implementation Method Based on a Maximum Interference Permissible Amount

[0095]If a maximum interference permissible amount of the m-th cell is defined as bm, the transmission method implementing unit 120 implements a transmission method while limiting a total sum of interference on adjacent cells to the maximum interference permissible amount or less, as represented by Math Figure 14. In this case, the maximum interference permissible amount means a maximum permissible amount of interference on adjacent cells from a transmitting terminal.

MathFigure14Hi(m)Wm2≤βm[Math.14]MathFigure15Wm=argmaxWmlog2det(I+(Hd(m)Wm)(Hd(m)Wm)H)[Math.15]

[0096]subject to

∥Hi(m)Wm∥2≦βm

[0097]Since Math FIG. 15 is related to a convex problem, a solution can be calculated using a convex optimization algorithm.

[0098](Multi-User Transmission Method that not only Considers Performance of a Corresponding Cell but also an Influence Due to Interference on Adjacent Cells During a Downlink)

[0099]FIG...

first embodiment

Non-Interference Transmission Beamforming Scheme

[0233]The non-interference transmission beamforming scheme is a transmission beamforming scheme that maximizes a data rate with respect to the k-th terminal under the condition where the base station 1300 does not interfere with the other terminals except for the k-th terminal in the corresponding cell and the terminals of the adjacent cells, when it is assumed that the base station 1300 transmits a data signal to the k-th terminal in the corresponding cell. In the non-interference transmission beamforming method, a transmission beamforming vector that is used when a data signal is transmitted to the k-th terminal of the m-th cell can be represented by Math Figure 28.

MathFigure28w(m,k)1=argmaxwheff(m,m,k)downwsubjecttoheff(m,m,k′)downw=0forallk′(k′∈Smandk′≠k),heff(m,n,k″)downw=0forallnandk″(n≠mandk″∈Sn)[Math.28]

[0234]In this case,

[0235]heff(m,n,k)down denotes an effective channel vector (1×Nb) that is obtained by multiplying a receptio...

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Abstract

The present invention provides a radio transmitting and receiving apparatus having multiple antennas that can decrease an influence due to interference between cells that exists in a multi-cell environment, by using a transmission method that not only considers performance of a corresponding cell but also an influence due to interference on adjacent cells and an influence due to interference from the adjacent cells in a multi-user and multi-cell environment, effectively use limited radio resources, and increase a data rate of a radio communication system, and a method thereof.

Description

TECHNICAL FIELD[0001]The present invention relates to a radio transmitting and receiving apparatus that has a plurality of antennas in consideration of interference between cells in a multi-user environment and a method thereof. More particularly, the present invention relates to a radio transmitting and receiving apparatus having a plurality of antennas that can improve performance of the entire system in consideration of interference due to and affecting cells adjacent to a cell to which the radio transmitting and receiving apparatus belongs as well as performance of the cell to which the radio transmitting and receiving apparatus belongs, when implementing a transmission method using the plurality of antennas, and a method thereof.BACKGROUND ART[0002]A multiple-input multiple-output (MIMO) technology increases a data rate and reliability of a radio communication system by installing a plurality of antennas in a transmitting terminal and a receiving terminal. However, studies on a...

Claims

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Application Information

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IPC IPC(8): H04B7/02H04B15/00
CPCH04B7/043H04B7/0452H04B7/0443H04B7/0434H04B7/0417H04B7/0617H04B7/0626H04W72/121H04W72/541
Inventor LEE, KWANGBOKLEE, BYONGOKSOHN, IIISOOJE, HUIWON
Owner SEOUL NAT UNIV R&DB FOUND
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